Mains Voltage Indicator with a LED.
Lightings
I need an AC line 220V light display or main voltage monitor. Because the home ‘s electric of his brother a very often problem. Below a figure is the 230V AC voltage indicator circuit. We use the LED for display the power ac line, because cheap and convenient. The other devices, nothing more. The R1 resistor act to reduce the current and a short circuit protection similar fuse. The C1 is the capacitor the current depression. It works well. When used with AC power. And rarely have problems with heat. The D1 diode is used to protect feedback voltage for …
LM338 / LM350  VOLTAGE REGULATOR CALCULATOR
Basic - Tools & Tips
You can use this calculator to vary the value of the program resistor (R1) and output set resistor (R2) and calculate the output voltage for the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This calculator will work for most DC Voltage Regulators with a reference voltage (VREF) of 1.25. Typically, the program resistor (R1), For the LM338 and LM350, 120 ohms is typically used. However, other values such as 150 or 220 ohms can also be used. Note: – LM317 DC voltage regulator circuits *** – Adjustable Power Supply 1.2 – 30V 5A using LM338 (With …
USB Battery Replacement by LM317
Power supply
My wife likes to listen to more music. But my son likes to play computer games a lot. At home we have a single computer. When ours son play game. The mother does not listen to music from our computer. Now the small mp3 player is very inexpensive, it can be used as a listening experience. But it need a battery 1.5V for power source, that Often, the battery low power. I edit the problem by creating a circuit. The power adapter is USB Battery Replacement to convert USB ports 5V voltage down to 1.5V. So I used the ever …
5V low dropout regulator circuit using transistor and LED
Basic Circuits
This is 5V low dropout regulator circuit using transistor and LED only so easy,lowest voltage input is 6V so across it is 1V only, make output is 5V 0.5A I have a 6V battery, but it needs to be applied to digital circuits that used to 5 volt regulated. In first, I will reduce this voltage with a single resistor, but the load current is not constant. The other way to use is a second, I would use 2 x 1N5402 diodes to connected in series to reduce the voltage to the load. But it don’t work because low current …
9V Low Power Switching Regulator by IC RC4193
Basic Circuits
This is the Power Switching Regulator 9V Circuit that is low current power output and It has strong point is the voltage input change from 2.4V to 10V but a constant voltage output 9 Volt. We used the RC4193 Micropower Switching Regulator is the base, easy to use and there are a few parts in circuit. The test battery point for check voltage of batter or input. The low power switching regulator IC, number: RC4193, that that Contained in a small body of caterpillar 8-pin. It is designed for devices that work with batteries. The DC regulator power supply is …